Java aktualizacja tabeli po kliknięciu przycisku w innym oknie

Question

Witam.

Mam napisany program z oknem głównym oraz dodatkowym, który dodaje elementy do bazy.

Jak najprościej zrobić aktualizację tabeli w oknie głównym po tym, jak zostanie kliknięty przycisk "Dodaj" w oknie dodatkowym? 

Są to 2 różne klasy. Niby mam metodę, która wypełnia tabelę ale nie mogę jej wywołać w innej klasie, bo miałbym do przekazania dużo parametrów i takie działanie jest bez sensu.

 

public class MainWindow extends javax.swing.JFrame {
    DefaultTableModel model;
    final JFrame frame = new JFrame(MainWindow.class.getSimpleName());
    
    
    /**
     * Creates new form MainWindow
     */
   // private Order zamowienie;
    public MainWindow() {
        
        initComponents();

        String n[] = {"ID", "Imie", "Nazwisko", "Produkt", "Ilość", "Razem(zł)", "Status", "Edytuj", "Usuń"};
        model = new DefaultTableModel(null, n);
        jTable1.setModel(model);
        jTable1.putClientProperty("terminateEditorOnFocusLost", Boolean.TRUE);
        jTable1.getColumnModel().getColumn(0).setMaxWidth(40);
        jTable1.getColumnModel().getColumn(4).setMaxWidth(40);
        RowSorter<TableModel> sorter = new TableRowSorter<>(model);

        jTable1.setRowSorter(sorter);

        
        
        ShowTable(model, jTable1, jLabel3, jLabel1, jLable2);
        
        
    }

private static void ShowTable(DefaultTableModel model, JTable jTable1, JLabel jLabel3, JLabel jLabel1, JLabel jLable2){
        OrdersDAL db = new OrdersDAL();
        Connection connection;
        connection = db.createConnection();   
        
        int numberOfOrders=db.CountOrdersInTheDb();
        int numberOfClients=db.CountClientsInTheDb();
        int numberOfProducts=db.CountProductsInTheDb();
        int numberOfOrderProducts=db.CountOrderProductsInTheDb();
        
        Order[] orders = db.TakeOrdersFromDb(numberOfOrders);
        Client[] clients = db.TakeClientsFromDb(numberOfClients);
        Product[] products = db.TakeProductsFromDb(numberOfProducts);
        OrderProduct[] ordProd = db.TakeOrderProductsFromDb(numberOfOrderProducts);
        
        double summaryValue = 0;
        
        for (int i = 0; i < numberOfOrders; i++) {
            String firstname = "";
            String lastname = "";
            int product_id = 0;
            String productName = "";
            double productPrice = 0.00;
            int numBoughtProducts = 0;
            
            int client_id = orders[i].getClient_id();
            String order_status = orders[i].getStatus();
            
            for (int j = 0; j < numberOfClients; j++) {
                if (clients[j].IsThisClient(client_id)) {
                    firstname = clients[j].getFirstname();
                    lastname = clients[j].getLastname();
                }
            }
           
            for (int j = 0; j < numberOfOrderProducts; j++) {
                if (ordProd[j].IsThisOrderProduct(orders[i].getId())) {
                    product_id =  ordProd[j].getProduct_id();
                    numBoughtProducts = ordProd[j].getNumber();
                }
            }
            for (int j = 0; j < numberOfProducts; j++) {
                if (products[j].IsThisProduct(product_id)) {
                    productName = products[j].getName();
                    productPrice = products[j].getPrice();
                }
            }
            
            summaryValue += productPrice*numBoughtProducts;
            
            model.addRow(new Object[]{orders[i].getId(), firstname, lastname, productName , numBoughtProducts, productPrice*numBoughtProducts ,order_status, "Edytuj", "Usun"});
            
        }
        jTable1.getColumn("Edytuj").setCellRenderer(new ButtonRenderer());
        jTable1.getColumn("Edytuj").setCellEditor(new ButtonEditor(new JCheckBox(),connection, jTable1, 1, model, numberOfOrders, numberOfClients,orders,ordProd, clients));
        jTable1.getColumn("Usuń").setCellRenderer(new ButtonRenderer());
        jTable1.getColumn("Usuń").setCellEditor(new ButtonEditor(new JCheckBox(),connection, jTable1, 2, model, numberOfOrders, numberOfClients,orders,ordProd, clients));          
                    
        jLabel3.setText(""+summaryValue+" zł");
        summaryValue = summaryValue/numberOfOrders;
        summaryValue *= 100; 
        summaryValue = Math.round(summaryValue);
        summaryValue /= 100; 
        jLabel1.setText(""+numberOfOrders);
        jLable2.setText(""+summaryValue+" zł");
}

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        String firstname = jTextField1.getText();
            String lastname = jTextField2.getText();
            String street = jTextField3.getText();
            String postcode = jTextField4.getText();
            String city = jTextField5.getText();
            String phone = jTextField6.getText();
            int order_id =0;
            int client_id = 0;
            
            if (phone.matches("[0-9]+") && phone.length() < 12) {
                OrdersDAL con = new OrdersDAL();
                Connection connection;
                connection = con.createConnection();

                client_id = con.TakeMaxIdFromClients();

                Client client = new Client(client_id, firstname, lastname, street, postcode, city, phone);
                client.AddToDatabase(connection);

                order_id = con.TakeMaxIdFromOrders();

                Order order = new Order(order_id, client_id);
                order.AddToDatabase(connection);

                int product_id=0;

                String product = (String)jComboBox2.getSelectedItem();
                String number = (String)jComboBox1.getSelectedItem();


                OrderProduct ordprod = new OrderProduct(order_id, Integer.parseInt(number));
                ordprod.AddToDatabase(connection);
            }else{
                showMessageDialog(null, "Uzupełnij poprawnie numer telefonu");
            }
    }